maltbt



(No Model.)

- F. D. MALTBY.

AIR PUMP.

Patented Mam. l0, 1885.

MMA/WW Unirse Smarts Partnr trice,

FRANK D. MAI/EBV, OF NEW YORK, N. Y.

mamut/ie.

SPECIFICATION forming part of Letters Patent No. 313,603, dated March 10, 1885.

(No model.)

.To all whom it may concern:

Be it known that I, FRANK D. Marmer, a citizen of the United States, and a resident oi' the city, county, and State of New York, have invented certain Improvements in Air-Pumps, of which the following is a specification.

My invention is an air-pump constructed, as fully described hereinafter, so as to permit the ready application of great operating force and efectually expel at each stroke all the air in contact with the piston.

In the drawings, Figure l is a sectional elevation of my improved air-pump. Fig. 2 is a transverse section. Fig. 3 is a vertical section on the line 1 2, Fig. 2. Fig. et is an elevation ofthe stem and abutment.

The pump consists ofa hollow stem or standard, D, achambered and valved abutment, C, extending radially therefrom, a cylinder or case, I, inclosing the abutment, and a radial piston, R, secured within the cylinder. Either the cylinder or the stem and its attachments is stationary and the other part movable. In the drawings the stem and its abutment constitute the stationary part of the pump, being supported by brackets J ,adapted to be secured to a vertical or horizontal support, T. Vhen the cylinder is stationary, it is also bolted to the support. The abutment C contains two separate chambers, XX', the former communicating with the inlet end of the tubular stein D, and the latter with the discharge end of said stem, and there are openings at the side of the abutment leading from each chamber.

To the discharge-openings are fitted suitable valves opening inward, and to the inlet-openings are tted other valves opening outward. The valves may be of any suitable construction. As shown, the valves U consist each of an inner head or disk, f', and a hollow slotted cylindrical stem, w, fitting nicely the opening in the sides of the abutment. Into one opening screws a detachable bushing, 7i, which is removed to permit the insertion of the valves, and a spring, e, between the valves forces each outward. The valves V are similar to the valves U, but the disks are outward and lie within somewhat larger recessest in the faces of the abutment, and springs g press them in ward. The ends of the stems w ofthe valves U are flush with the outer faces of the abutment,

' pel the air.

as are theonter faces of the disks or heads f of the valves V, and the springs g lie and nt nicely in recesses in the sides of the abutment, so that when the valves are closed there will be no unoccupied recesses in the sides of the abutment, except the annular recesses round the heads ofthe valves V. The abutment and the piston It are so formed that either side of the piston, when brought against the corresponding side ofthe abntment,will be in contact therewith at all points, so that there is practically no space for air, which, being therein confined under great pressure, would expand on the separation of the piston and abutment and exert a pressure preventing the opening of the valves andreducing the efficiency of the pump. The piston R has at the in- Vner edge and at each end a channel receiving a suitable packing, as has also the abutment C, as shown, and the cylinder I is provided with a radial handle, S, whereby the cylindrical part of the pumpmay be rocked upon the stationary partcto carry the piston first to one side of the abutment and then to the other. As the piston moves toward the abutment the air is forced from between them through the valves U into the chamber X, 'and when the piston leaves the abutment the valves V lift and the air passes from the chamber X to the space between the piston and abutment, the operations on the other side being reversed.

By the construction described great pressure may be readily applied to exhaust and ex- There is no means afforded for any air to remain in the chamber in which it is compressed. The valves will therefore work easily and eifectually, and the packings secure tight joints without undue friction.

To secure a more uniform action,there may be two pistons and two abutments, as shown in dotted lines, Fig. 2, whereby the air is taken into and forced from two chambers at once.

W'ithout limiting myself to the precise construction and arrangement of parts shown, as they may be varied without departing from the main features of my invention, I claiml. An airpump consisting of a hollow stem carrying a radial chambered abutment provided wit-h outlet and inlet valves, a casing inclosing said abutment and provided with a radial piston, the sides of the latter and of the ICO abutment conforming to each other, so as to stems with heads or disks at their inner ends expel all the air from the casing, substantially and provided with detachable bushings, Whereas set forth. by the valves may be removed, substantially 2. The combination of the casing carrying a as described.

radial piston and the stem carrying` a radial In testimony whereof I have signed my name chambered abutment having side openings, to this specification in the presence of two suband valves and springs tted to recesses in the seribing Witnesses.

faces of the abutment, so as to present fiat un- FRANK D. MALTBY.

interrupted sides, substantially as set forth.

8. The combination, with .the ehambered abutment, of valves having tubular slotted Witnesses:

DANIEL E. DELAvAN, D. B. WILMOT. 

